Applications manual
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GB125 Concentric Vent
Design Manual
GB125 Concentric Vent Design Manual | 05.2009
Technical specifications are subject to change without prior notice
5.
Installing the flue gas system
5.1. General installation notes
WARNING! RISK OF DEATH FROM LEAKING
FLUE GASES.
Improper installation of venting system and
components or failure to follow all installation
instructions can result in property damage or
serious injury.
5.2. Trimming pipes
CAUTION! RISK OF INJURY FROM SHARP
EDGES.
Wear work gloves.
– With concentric pipes, pull the inner pipe out of the
outer pipe in the direction of the gasket.
– Trim pipes at a right angle to the required length x
(Fig. 2).
– Trim the same length off the flue gas and air intake
pipes.
– Carefully remove burrs from cut edges; otherwise
gaskets will get damaged, which can result in the
system no longer being air tight and condensate to
leak.
– Reinstall the flue gas and air intake pipes.
5.3. Installing the pipes
Pipes are assembled so that the sleeve points in the
direction of the flue gas stream, with the gasket on the far
side of the pipe when viewed from the boiler. Only use
original Buderus flue gas pipe gaskets!
– Coat the gaskets (Fig. 3 Item 1) and pipe ends with
CENTROCERIN®
gasket lubricant (supplied with the basic kit).
– Push the flue gas pipes (Fig. 3 Item 2) into one another
with a slight turning motion until the stop.
– With concentric pipes, push the combustion air pipe
(Fig. 3 Item 2) together to ensure a tight fit.
– Verify that the gaskets did not shift.
– Never use screws to hold pipe together.
– If needed suspend pipe from the ceiling or the floor.
Fig. 2 Cuttting pipes
X: Desired length
Fig. 3 Pipe assembly
1: Location of the gaskets
2: Flue pipe
3: Combustion air pipe
